We call the forgiveness we receive at the time we are saved eternal forgiveness. This is the forgiveness of which the Lord Jesus spoke when He said, “Repentance and remission of sins should be preached in his name unto all the nations, beginning from Jerusalem” (Luke. 24:47). This is also what Romans 4:7 refers to: “Blessed are they whose iniquities are forgiven, and whose sins are covered.”
We call this kind of forgiveness eternal forgiveness because once God forgives our sins, He forgives them forever. He casts our sins into the sea, into the depths of the sea, so that He no longer sees nor remembers them. Such is the forgiveness we receive at the time of salvation. For us who believe in the Lord Jesus, He forgives all our sins and takes away all our iniquities so that before God none are left. This is eternal forgiveness.